adj. 25B6; adjective
a forbidding manner : HOSTILE, unwelcoming, unfriendly, off-putting, unsympathetic, unapproachable, grim, stern, hard, tough, frosty.
the dark castle looked forbidding : THREATENING, ominous, menacing, sinister, brooding, daunting, fearsome, frightening, chilling, disturbing, disquieting.
friendly, inviting.